Combination square and protractor.



E. OEHRLE.

COMBINATION SQUARE AND PROTRAOTOR.

. APPLICATION FILED NOV. 12, 1907. 1,01 0,678.

v Patented Dec. 5, 1911'.

2 SHEETS-SHEET 1.

8 v l5 B m 12 K 6 2r I 1' v /4- Emanuel Oebrle, 3mm.

attowu COLUMBIA PLANOGRAPH CO.,WASHINGTON, D. c.

v E. OEHRLE.

' COMBINATION SQUARE AND PROTRAGTOR.

' 'APPLIOATION FILED NOV. 12, 1907.

1,010,678, Patented Dec.5,19l1.

2 SHEETSSHEET 2.

fullilmmir r v Emanuel oekrle, 21mm,

- COLUMBIA PLANOGRAPH CCL,WASH!NUTON, D. c.

EMANUEL onnnnn, or OMAHA, NEBRASKA.

' COMBINATION SQUARE AND PROTRACTOR.

Specification of Letters Patent.

Application filed November 12, 1907.

Patented Dec. 5, 1911.

Serial No. 401,869.

To all whom it may concern:

Be it knownthat I,EMANUEL OEHRLE, a citizen of the United States, and a resident of Omaha, in the county of Douglas and State of Nebraska, have invented certain new and useful Improvements in Combination Squares and Protractors,of which the following is a specification.

My invention relates to combination squares and protractors of the type shown in United States Letters Patent No. 798,695, issued to me Sept. 5, 1905, and it is the object thereof to provide in an instrument of this class certain improvements in the form of the head, in the means for holding the rotatable disk in adjusted positions, in the means for adjusting the limitof movement of the disk, and in the graduations thereof.

A further object of the present invention is to provide bodies attachable to one side of the head, to furnish a working face at a different angle with the base-surface from that of the face to which the bodies are attached, in order to facilitate certain special operations as will bemore fully described hereinafter.

Constructions embodying my invention are illustrated in the accompanying drawings, in which- -Figure 1 is an elevation of one side of the head and blade, Fig. 2 is an elevation of the reverse side of the same, showing the blade set at a position intermediate between its limits of movement represented by full and dotted lines in Fig. 1, Fig. 3 is a sec-' tional view taken on the plane of'the line 33 of Fig. 1, Figs. 4c, 5 and 6 are elevations of the instrument with the various auxiliary bodies secured on the miter-surface of the head, Fig. 7 is a detail section on the line 77 of Fig. 1, Fig. 8 is a plan view projected from Fig. 6 and showing certain graduations on the miter-surface of the head, and Figs. 9 and 10 are side and plan views, respectively, of one of the bodies at-.

tachable to the miter-surface of the head.

In the construction shown I provide .a main body or head 1 havingtwo'working faces thereon, which faces, together with their prolongation to a point ofintersection, form an acute angle. The face 2 is hereinafter referred to'as the base-surface, and the face 3, being at an angle of 45 with the base-surface, is referred to as the mitersurface. A spirit level 4 is disposed parallel with the base-surface, as shown. In the head between the faces 2 and 3 is a circular opening in which is placed an annular disk 5 which is retained in the opening by the inwardly extending flange 6 at one side of the head, and by the small flat-headed screw 7 disposed at the opposite side as shown in Fig. 1. At one side of the annular disk 5 is a radial kerf which passes through the inwardly extending lug 8. A screw 9, having a tapered head, passes through said lug and on the end of said screw is a nut 10 by which with by means of the stem 12, the hooked end of which engages the longitudinal groove in the blade 11, and the inner end of which is threaded and carriesthe adjusting-nut 13 by which the stem may be drawn inwardly and the blade held firmly against the bottom of the slot through the disk. The extent of the slot through the head is indicated by the two extreme positions of the blade. shown in full and dotted lines in Fig. 1, and the form of the head is such that for all positions of the blade the outer edge thereof along its entire length extends clear of the head. When the disk and blade are turned to the position shown in full lines in Fig. 1, with the edges of the blade parallel with the base-surface, the inner edge of the blade rests against the bottom of the slot through the head, which thus forms one of the limits of movement of the blade and disk. The other stop or limit of rotation is formed by the end of a small screw 14., with which the edge of the blade engages whenturned to the position shown by dotted lines in Fig. 1, the screw being so adjusted that the blade will be perpendicular to the base-surface. The said screw being at an inclined position, as shown in Fig. 7 the end thereof is pointed or bev-. eled so that the side thereof which engages the blade will rest squarely thereon. It

should be noted that, in moving the adjusting screw, the screw-driver is applied to the end thereof opposite that engaging the blade, so that any resulting mutilation of the screw will not affect the accuracy of adjustment, as where the adjustment is made by engaging a screw at the same end which contacts with the blade.

For convenience in setting the blade at various angles with reference to the faces of the head, the disk 5 is graduated as represented at A, B, and C in Figs. 1 and 2, the said graduations being referred, respectively, to the lines a, b, and c on the head. The graduations at A form an ordinary scale of degrees from 0 toQO The graduations at B are for laying off angles given in terms of run and rise one of the numbers taken being the number 12 and the other number being that marked opposite the appropriate graduation on the disk. Thus the blade is shown in Fig. 2 as set for an angle at which the run and rise are equal, or 12 to 12. This scale of graduations is also used for determining the cuts for rafters, the run being one-half the width of the building. The graduations at C are used in determining the cuts for hip rafters in roofs of different pitches. Graduations D may be placed on the miter-surface 3, as shown in Fig. 8, and the edge of the blade set thereto for determining the angles for cutting timbers to be used in polygonal structures.

In Fig. 5 is shown a center-square attachment 15, which is secured upon the miter-surface 3 of the head 1 by means of a small stud 1G and nut 17 the stud being secured in one arm of the center-square and passing through the slot 18, shown in Fig. 7 in the arm of the head on which the miter-surface is formed. That arm of the center-square attachment opposite the stud is slotted to permit the passage of the blade 11, which may be turned to any angle with reference thereto, adapting the attachment for the various uses described in my Patent No. 798,695, hereinbefore referred to.

In Figs. 4, 9 and 10 is shown a squaringattachment for use in laying out lines at complementary angles, such as the horizontal and plumb-cuts of rafters, or the rise and tread of stairs. This attachment comprises two arms, 19 and 20, having faces at an angle of 45 with each other. At the sides of the short arm 19 are small lugs 21 adapted to fit over the sides of the head 1. A stud l6 and nut 17 enable the attachment to be secured on the miter-surface of the head in the same manner as the centersquare attachment, and when so placed the surface 22 of the longer arm 20 is perpen dicular to the base-surface 2 of the head. The arm 20 is centrally slotted to receive the blade 11, as shown. In laying out complementary angles, the blade is set to one of the angles, the base-surface is applied to the work, and a line scribed along the edge of the blade. Vithout changing the setting of the blade, the surface 22 is then applied to the work, and the edge of the blade gives the line forming an angle complementary to that first given.

In Figs. 6 and 8 is shown an attachment 23 for measuring and gaging the angles between the sides of tapering or wedge-shaped bodies. This attachment is similar to the squaring-attachment, having faces at the 'same angle with each other, and being secured to the head by a stud and nut in the same manner. The long arm thereof is not slotted, however, as is the arm 20 of the squaring-attachment, and the face 24 of said arm is adapted to be engaged by the inner edge of the blade when the same is turned to its position perpendicular to the basesurface.

Now, having described my invention, what I claim and desire to secure by Letters Patent is:

1. In an instrument of the class described, a head, a graduated annular disk revolubly held in said head, there being a kerf through one side of the disk, and means for spreading the disk at the kerf, said spreading means comprising a screw passing through the side of the disk at the kerf, said screw having a tapered portion thereon, and a nut :lforfmoving the screw longitudinally of the er 2. In an instrument of the class described, a head, a graduated disk revolubly retained in the head, means for clamping the disk at adjusted positions with relation to the head, a blade adjustably connected with the disk, and a screw passing through a portion of the head and adapted to engage one edge of the blade to limit rotation of the disk, the screw being engageable by a screw-driver at the end opposite that contacting with the blade.

3. In an instrument of the class described, a head having a base surface at one side thereof and a miter surface extending at an angle of forty-five degrees with said base surface, a body removably secured upon the said miter surface, the body having an arm with a surface perpendicular to the base surface, a disk revolubly held in the head at a position substantially such that a plane bisecfing either the right dihedral angle formed between the planes of the base surface and the perpendicular surface or the acute dihedral angle formed between the planes of the base surface and the miter surface will pass through the axis of the disk, and a blade connected with the disk and extending to intersect each of the said surfaces of the head and arm.

4. In an instrument of the class described, a head having at the sides thereof a base surface and a miter surface extending at an angle of 45 degrees to said base surface, an

- arm removably secured upon said miter surface and having a surface perpendicular to the base surface, a disk rcvolubly held in the head at a position such that the axis of the disk lies in a plane bisecting both the dihedral angles formed between the base surface and miter surface and the base surface and perpendicular surface, and a blade connected with the disk, the blade extending through a slot intersecting each of the said surfaces of the head and arm, and the extent of the slot permitting rotation of the blade around the axis of the disk from a position parallel with the base surface to a position perpendicular thereto.

5. In an instrument of the classdescribed, a head having a base-surface at one edge thereof, amiter-surface arranged at an acute angle with said base-surface, a disk revolubly held in said head, a blade carried by the disk, an auxiliary body adapted to fit upon the miter-surface, a stud carried by said auxiliary body, there being a slot in that portion of the head on which the miter-surface is formed, the stud extending through said slot, and a nut carried by the stud for removably holding said auxiliary body against the miter-surface.

In testimony whereof I have hereunto subscribed my name in the presence of two witnesses.

EMANUEL OEHRLE.

Witnesses:

D. O. BARNELL, RoY G. KRATZ.

Copies of this patent ma; be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

